whats the best way to free a stuck clutch big red 250

Hi everyone
this is my first post on this board so not sure if this is where this post should be so,,,,,
I just got an old Honda Big Red 3 wheeler going the other day and I noticed the clutch is stuck.
it shifts but you can feel the clutch is stuck.
seems like I remember from and old Gold Wing I had years ago you can just drive the thing until it pops loose .
are there any tricks anyone knows to help it along so I don’t Damage my gears to much?
thanks for any ideas you guys may want to share